Odd Artifact in Z scale

I read that the size limits of the TC editor are ~1 m³ ("100 cm x 100 cm x 100 cm")  No problem.

I'm currently working on a project that's ~27"³.  For some reason, any parts (so far) of the project extending above ~19.5" in the Z direction ("up") are shaded.
This hasn't (yet) caused any problems other than looking odd.  I was just wondering...



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